Light-emitting apparatus having a heat-resistant glass substrate separated through a vacuum layer from a glass substrate used as the light projection plane

摘要

Provided herein is a light-emitting apparatus capable of achieving both improved durability and higher brightness with an inexpensive and simple construction. A heat resistant glass substrate 51 is mounted in a vacuum chamber 5, and while an anode electrode 8 (and a light emitter 20) is mounted on the glass substrate, the glass substrate 51 is separated from a glass substrate 11. This precisely protects the vacuum chamber 5 from thermal damage due to light emission upon excitation, even when the current density between the cathode electrode 6 and the anode electrode 8 is controlled at a high level to cause the light emitter 20 to emit light at high brightness. Accordingly, this eliminates the need to make the entire vacuum chamber 5 excessively heat-resistant, permitting construction from an inexpensive material such as soda-lime glass; consequently both improvements in the durability of the light-emitting apparatus 1 and enhancement in brightness thereof can be accomplished with an inexpensive and easy construction.